A ball is released from rest at the edge of a -high cliff at the exact same instant a…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A ball is released from rest at the edge of a

30\,\text{m}

-high cliff at the exact same instant a second ball is thrown straight upward from the base of the cliff with a speed of

15\,\text{m/s}

. Ignore air resistance. How far below the top of the cliff do the two balls pass each other? (a)

15\,\text{m}

(b)

20\,\text{m}

(c)

10\,\text{m}

(d)

25\,\text{m}